1

After copying my Ubuntu installation from one disk to another (copy, update fstab, update-grub, grub-install /dev/sda1), the Ubuntu CD option boots from the first hard disk (localboot 0x80) – it boots the system just fine. The BIOS doesn't boot from the hard disk though.

I have a Compaq 6730s. BIOS settings: UEFI is off, SATA is AHCI.

I do not have this problem using the old hard disk.

2

Try adding a boot flag to a partition.

Run fdisk and command "a".

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